linux-kernel - Re: [PATCH] cgroups: Allow dynamically changing net

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Message-Id: <20151123.121528.2032846721707900257.davem@davemloft.net>
Date:	Mon, 23 Nov 2015 12:15:28 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ninasc@...com
Cc:	daniel.wagner@...-carit.de,
	"nhorman@...driver.comnetdev"@vger.kernel.org, lizefan@...wei.com,
	hannes@...xchg.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-team@...com, tj@...nel.org
Subject: Re: [PATCH] cgroups: Allow dynamically changing net_classid

From: Nina Schiff <ninasc@...com>
Date: Fri, 20 Nov 2015 12:16:10 -0800

> The classid of a process is changed either when a process is moved to
> or from a cgroup or when the net_cls.classid file is updated.
> Previously net_cls only supported propogating these changes to the
> cgroup's related sockets when a process was added or removed from the
> cgroup. This means it was neccessary to remove and re-add all processes
> to a cgroup in order to update its classid. This change introduces
> support for doing this dynamically - i.e. when the value is changed in
> the net_cls_classid file, this will also trigger an update to the
> classid associated with all sockets controlled by the cgroup.
> This mimics the behaviour of other cgroup subsystems.
> net_prio circumvents this issue by storing an index into a table with
> each socket (and so any updates to the table, don't require updating
> the value associated with the socket). net_cls, however, passes the
> socket the classid directly, and so this additional step is needed.
> 
> Signed-off-by: Nina Schiff <ninasc@...com>

Applied.
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